Answer
a. $F^-$
b. $Ca^{2+}$
c. $Na^+$
d. $I^-$
Work Step by Step
1. Identify the symbol for each element.
a. F
b. Ca
c. Na
d. I
2. Identify the charge of each ion.
a. Since $F$ is from Group (7A), the charge is $-1$.
b. Since $Ca$ is from Group(2A), the charge is $+2$
c. Since $Na$ is from Group (1A), the charge is $+1$
d. Since $I$ is from Group (7A), the charge is $-1$
